* Chairman reiterates top priority is to help investors

* Evergrande shares surge as much as 32%, units gain

* Fed Chair Powell says not a lot of direct US exposure

* Investors, analysts play down threat of "Lehman moment" (Recasts with chairman's comments, share price)

HONG KONG/SINGAPORE Sept 23 (Reuters) - Indebted property giant China Evergrande will make it a top priority to help wealth investors redeem their products, its chairman said, as investors await a key deadline for a dollar-bond coupon payment on Thursday.

Hui Ka Yan said the company was striving to ensure quality delivery of properties and stressed the importance to resume construction on developments where building had been halted.

His comments come as Evergrande, which was founded in 1996, faces mounting pressure to quell anger among homebuyers and retail investors who have sunk their money into the group's properties or its wealth management products.

Evergrande shares, which have plunged around 85% this year, jumped as much as 32% in resumed trade on Thursday after a public holiday, marking their biggest single-day percentage rise since its listing in 2009.

The bounce was seen mainly as a reaction to Wednesday's news that an Evergrande unit had resolved a coupon payment with creditors, although this was just one of the hurdles the company faces as it labours under a $305 billion mountain of debt.

The group's electric vehicle and property services units climbed around 3% and 9%, respectively.

The chairman's comments late on Wednesday were "clearly aimed at stabilising markets but there seems to be not much information for bond holders," said a source familiar with the situation.

"There's no clear plan as yet but we expect the debt to be restructured at some point," said the source, who declined to be identified as he was not authorised to speak to the media.

Global investors have been on tenterhooks as the deadline looms, worried that the company's malaise could spread beyond the country’s property sector and pose systemic risks to China's financial system.

Chinese Estates Holdings, the second-biggest shareholder of Evergrande, said on Thursday it had sold $32 million worth of its Evergrande stake and planned to exit the holding completely.

On Wednesday, global markets reacted with relief when the People's Bank of China's injected 90 billion yuan ($13.9 billion) into the banking system and an Evergrande unit said it had "resolved" a coupon payment on an onshore bond.

But it faces $83.5 million in dollar-bond interest payments due on Thursday on a $2 billion offshore bond. And more payments are coming due next week, with a $47.5 million dollar-bond interest payment due.